Signal Analysis. Time,Frequency,Scale,and Structure

Аннотация

Analog, discrete, and digital signals are the raw material of signal processing and analysis. Natural processes, whether dependent upon or independent of human control, generate analog signals; they occur in a continuous fashion over an interval of time or space. The mathematical model of an analog signal is a function de$ned over a part of the real number line. Analog signal conditioning uses conventional electronic circuitry to acquire, amplify, $lter, and transmit these signals. At some point, digital processing may take place; today, this is almost always necessary. Perhaps the application requires superior noise immunity. Intricate processing steps are also easier to implement on digital computers.